package com.netty8018.httpserver;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;
import java.nio.charset.StandardCharsets;

/**
 * @author liyanhao
 * @Date 2023-02-05 4:44
 * <p>
 * SimpleChannelInboundHandler 是ChannelInBoundHandlerAdapter
 * httpObject 客户端和服务端互相通讯的数据被封装成HttpObject
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    //channelRead0读取客户端数据

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        //判断msg是不是httpRequest请求
        if (msg instanceof HttpRequest) {
            System.out.println("pipline hashCode "
                    + ctx.pipeline().hashCode() + " TestHttpServerHandler hash=" + this.hashCode());
            System.out.println("msg 类型=" + msg.getClass());
            System.out.println("客户端地址" + ctx.channel().remoteAddress());
            //获取到
            HttpRequest httpRequest = (HttpRequest) msg;
            //获取uri 过滤指定的资源
            URI uri = new URI(httpRequest.uri());
            if ("favicon.ico".equals(uri.getPath())) {
                System.out.println("请求了 favicon.ico 不做响应");
                return;
            }
            //回复信息给浏览器 [http协议]
            ByteBuf content = Unpooled.copiedBuffer("hello 我是服务器", CharsetUtil.UTF_8);
            //构造一个http的响应 即httpresponse
            DefaultFullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,
                    HttpResponseStatus.OK, content);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
            //将构建好 response返回
            ctx.writeAndFlush(response);
        }
    }
}
